different editions of The Real Act Prep have different tests?

<p>I don't know whether I should order only one of them or both. Does the new edition (September 2011) have totally new tests or is it 3 tests from the old book and 2 new tests?</p>

<p>Amazon.com:</a> The Real ACT (CD) 3rd Edition (Real Act Prep Guide) (9780768934403): Inc. ACT: Books New edition (2011) of the Real Act Prep</p>

<p>Amazon.com:</a> The Real ACT Prep Guide (The only guide to include 3 Real ACT tests): ACT: Books old edition (2005) of the Real Act prep</p>

<p>and apparently there's one more, 2007 edition Amazon.com:</a> The Real ACT Prep Guide: The Only Guide to Include 3Real ACT Tests: ACTOrg: Books</p>

<p>Are they any different?</p>

<p>The first three tests are the same in all books.</p>